Arsene Wenger's future has been thrown into fresh doubt after Thierry Henry claimed the Arsenal manager's refusal to sign a new contract was the main reason he is joining Barcelona.

Talismanic captain Henry is on the verge of a £16 million move to Spain, with the Gunners confirming only a medical and other formalities had yet to be completed.

Wenger's current deal expires at the end of the forthcoming season and, although he has vowed not to walk away from Emirates Stadium before then, he has avoided making any commitment beyond that.

Henry (left) has been a disciple of Wenger since their days at Monaco 15 years ago, and he fears his mentor will quit next summer.

In a letter to supporters, the 29-year-old striker said: "Arsene has been part of my life for as long as I can remember.

"Unfortunately and understandably, he has said that at this moment he will not commit to the club past the expiration of his current deal which finishes at the end of the coming season."

Henry, Arsenal's record scorer with 226 goals in 364 games over his eight seasons, has already expressed his disappointment at the acrimonious exit of vice-chairman David Dein and insists he cannot risk losing Wenger as well.

He added: "I respect his decision and his honesty but I will be 31 at the end of next season; I cannot take the chance to be there without Arsene Wenger and David Dein."

Ironically, Wenger may feel the same about the departure of Henry, who he converted from a struggling winger into one of the most feared forwards in the world after bringing him to the club eight years ago.

The studious Frenchman has earned a reputation as one of the most astute talent- spotters in the game, creating a conveyor belt of outstanding young players which has in turn allowed him to replace many of Arsenal's big names.

But it is no secret he saw Henry's vast experience as vital to helping nuture much of that talent.

Lacking the financial muscle of Chelsea, Manchester United and Liverpool, Wenger would have also been able to use his captain to attract players to Emirates Stadium.

Many of the Gunners' transfer targets may be dissuaded from joining if they believe both Henry and Wenger will leave the club.

World Cup winner Henry has reportedly agreed a four-year deal with Barca.

The Spanish club's vice-president Ferran Soriano has confirmed talks were at an "advanced" stage, and revealed it was "the wish of all parties" for an agreement to be reached and Henry could be presented as a Barca player tomorrow.

Henry added: "This is solely my decision, no one has forced me to do anything and I will represent myself in this transaction. I feel it is something I just had to do.

"Barcelona are a wonderful club steeped in tradition and play beautiful football. I'm sure I will be very happy there.

"But I will miss the Arsenal fans dearly, they have supported me through thick and thin.

"They will always be in my heart, as will all the fans who make the game here so special. I will always have a special bond with Arsenal Football Club."